Wide link design 105 double front derailleur for increased rigidity and improved shifting responseFor use with 105 ST-5800 or Ultegra ST-6800 shifters only for optimum shifting performanceWide inner link increased rigidity and takes front shifting performance to a new level, especially under heavy loadFor 11-speed drivetrainsLong pull arm for light action spring reduces effort required to actuate shiftsMaximum capacity of 16 teeth with 46-53 tooth outerThe aluminium parts are coated to resist corrosion and maintain their great looks